Process and apparatus for spinning staple fibers

ABSTRACT

A process and apparatus for spinning staple fibers wherein a sliver is continuously delivered to a separation roller where individual fibers are separated from such sliver. The thus separated individual fibers are accelerated by means of an air current approximately to the peripheral velocity of the inner wall of a hollow body member, and then the individual fibers are delivered approximately tangentially to a quickly rotating hollow body member to form thereat a fiber ring, and finally, the yarn is axially withdrawn out of the fiber ring.

The present invention has reference to an improved process and apparatusfor spinning staple fibers. In so doing, a continuously delivered sliveror band is separated into individual fibers by means of a rotatingseparating roll or roller and the individual fibers are transported tothe inner wall of a quickly rotating hollow body member, there collectedand withdrawn as twisted yarn.

With a known spinning device operating in this manner the individualfibers are lead to the inner wall of a hollow body member in which thereis located an annular groove provided with bores and inwardly directedneedles. The fiber-air current coming from the separating roller isconducted through these bores located in the needle field. Such boresmust be appropriately large and numerous in order to permit passage of asufficient quantity of air. Since the fibers must also be collected uponthe same surface there automatically occurs sucking-in of fibers intothese bores. When this happens the fibers are fixedly held and can nolonger be spun onto the existing yarn. Either these fibers are entrainedfrom time to time, in which case there appear undesired thick locationsat the yarn, or the bores become completely closed. In the latter caseair no longer flows through these bores and the yarn becomes thinner andthinner until it breaks.

In the known spinning device the hollow body member rotates at aconsiderably higher speed than the separating roller. Consequently, itis not possible to prevent that the individual fibers floating in theair current or stream will be grasped by the newly formed yarn beforethey have assumed the speed of the hollow body member and have depositedupon the inner wall at the hollow body member provided with bores. Theythen build curls about the yarn which disadvantageously affect its tyingtogether, its appearance as well as its strength.

It is to be appreciated the speed of rotation of the separation rollercannot be increased as desired, because the fibers must be carefullycombed out of the delivered sliver without being torn. A shortening ofthe fibers would reduce the quality of the yarn to an undesired degree.

Accordingly, it is a primary object of the present invention to providean improved process for the separation of fibers from the fiber-airmixture of a spinning device of the above-mentioned type whileovercoming the disadvantages previously indicated.

A further important object of the present invention is directed to animproved apparatus for the spinning of fibers which enables toeffectively separate the fibers from pg,2 a fiber-air mixture so thatthe quality of the spun yarn is not impaired.

Another considerable object of the present invention relates to animproved spinning device incorporating a separation roller and arotating hollow body member, and means disposed between said separationroller and hollow body member for accelerating a fiber-air mixtureapproximately to the peripheral speed of the aforesaid hollow bodymember.

The process contemplated according to the present invention incorporatesthe features of accelerating the individual fibers with the surroundingair -- sometimes referred to herein as fiber-air current -- duringmovement from the separation roller to the quickly rotating hollow bodymember approximately to the peripheral speed of such hollow body member,conducting the individual fibers together with the surrounding air tothe inner wall of the hollow body member, such inner wall being providedwith .Iadd.a groove and .Iaddend.combing means, separating theindividual fibers at this location from the entrained air current due tothe centrifugal action, collecting and holding the fibers by the combingmeans until their withdrawal as a spun or completed yarn whiledeflecting and sucking-off the air current cleaned or freed of fibers.

The spinning device of the present invention employed for the executionof the aforementioned process, according to one inventive embodiment, isdesigned to accelerate the fibers by means of an accelerating rollerarranged between a separation member, e.g., separation roller and ahollow body member, the aforesaid acceleration roller can beadvantageously provided with air passage means and combing means. Theperipheral speed of this acceleration roller is approximately as largeas that of the hollow body member.

A further possibility for accelerating the fibers is based upon thefeature of narrowing the cross-section of a communicating or connectingchannel leading from the separation roller to the hollow body member,thereby achieving acceleration of the air current.

A further aspect of the present invention concerns itself with theguiding of the air in the hollow body member. Initially, the fiber-aircurrent flowing-in with a high velocity is guided to the inner wall.Iadd.forming a groove .Iaddend.of the quickly rotating hollow bodymember in order to be there deflected, cleaned or freed of fibers andthen sucked-off. The individual fibers are thrown by the centrifugalaction against the inner wall of the quickly rotating hollow bodymember, collect in the .Iadd.groove with the .Iaddend.combing zone untilthe desired yarn thickness, remain lying there until they are spun ontothe yarn which moves further with its withdrawal speed along the innerwall of the quickly rotating hollow body member.

Other features, objects and advantages of the present invention willbecome apparent by reference to the following detailed description anddrawings wherein:

FIG. 1 is a side view in cross-section of the feed roller, theseparation roller and the acceleration roller with communicating airchannel;

FIG. 2 is a plan view, partly in cross-section, of the accelerationroller, the hollow body member with .Iadd.an air accelerating.Iaddend.blower means and the withdrawal rollers of the spinning deviceof FIG. 1;

FIG. 3 is a side view of a further embodiment of spinning device showingdetails of the feed roller, separation roller and a connecting channelhaving a narrowing cross-section in the direction of the hollow bodymember; and

FIG. 4 shows in cross-section details of the physical structure of anarrangement somewhat similar to FIG. 3, yet here incorporating amodified form of hollow body member with a central suction arrangementfor a number of spinning devices.

Describing now the drawings, in the embodiment depicted for purposes ofillustration in FIGS. 1 and 2 a sliver or band 1 is delivered by meansof a feed porcupine roller 2 rotating in the direction of arrow C to aseparation roller 3 rotating at greater velocity in the direction ofarrow D. The separation roller 3 is provided with needles 4 which combindividual fibers 5 out of the .Iadd.slow moving .Iaddend.sliver 1 andentrain such fibers in its direction of movement. After the separation.[.rollers.]. .Iadd.roller .Iaddend.3 there is arranged an accelerationroller 6 revolving at a higher velocity. An air channel 7 mergestangentially with .[.an.]. .Iadd.a discharge .Iaddend.opening 8 providedat the inner wall of a hollow body member 9. It will be understood thatthe feed porcupine roller 2, the separation roller 3 and theacceleration roller 6 rotate within a housing which for reasons offabrication is formed by the housing portion 10 and the cover member 11.The mentioned rollers are driven by shafts which drive a number ofspinning devices. Thus, it will be seen the shaft 12 drives theacceleration roller 6, the shaft 12a the feed porcupine roller 2 and theshaft 12b the separation roller 3. Moreover, the separation roller 3 andthe acceleration roller 6 are advantageously formed of the same membersfor reasons of fabrication. It will further be seen that such embodyboth flanges 13 and 13a and the needle runways or arms 14 provided withthe needles 4 secured between the aforesaid flanges 13 and 13a.

The air channel 7 is disposed in a removal guide member or core 15. Suchis laterally secured by a projecting edge or shoulder 16 .Iadd.so thatthe air channel 7 is stationary.Iaddend.. The hollow body member 9 hasits axis substantially parallely disposed with respect to the axes ofthe rollers arranged in the housing portion 10 and embraces the guidecore 15. This hollow body member 9 is rotatably mounted by means of abearing 19 upon a hollow shaft 17. This hollow shaft 17 in turn isconnected at one end in a support 18. Moreover, the hollow body member 9is driven contra the direction of rotation of the acceleration roller 6through the agency of a belt 20. It will also be seen that in the wallof the hollow body member 9 there is located a substantially V-shaped,smooth walled, annular groove 21 for collecting the individual fibers 5.Forwardly directed needles 22 are mounted at the base of the annulargroove 21. The compartment 21a surrounded by the annular groove 21 isseparated by a frontal wall 24 from the air ducts or channels 23 of thehollow body member 9 functioning as .Iadd.an air accelerating.Iaddend.blower means. This frontal wall 24 is provided with an opening25 through which extends the hollow shaft 17 with a guide disk 26..Iadd.The frontal wall 24 serves as one wall of the annular groove 21and extends inwardly towards the axis of rotation of the hollow bodymember 9. .Iaddend.

If the spinning device depicted in FIGS. 1 and 2 is placed intooperation then such works as follows: The feed porcupine roller 2steadily delivers a sliver or band 1 .Iadd.at low speed.Iaddend..Individual fibers 5 are continuously combed out of the sliver 1 by meansof the needles 4 of the quicker rotating separation roller 3. The thuscombed out individual fibers are entrained in the direction of movementof the separation roller 3 indicated by reference character D. Theblower action of the air channels 23 generates an air suction currentwhich moves through the intermediate spaces between the needle runwaysor arms 14 of the acceleration roller 6 and the separation roller 3.This air suction current or stream loosens the individual fibers 5 fromthe needles 4 of the separation roller 3 and transmits them to theacceleration roller 6 revolving at a very high velocity.

The different lengths of the arrows C, D and E signifies that thecorresponding rollers move with different high velocities. In reality,the increase of the number of revolutions is larger and a multiple ofthe previously arranged roller. The peripheral speed of the accelerationroller 6 completely or approximately corresponds to that of the hollowbody member 9. The moving needle runways 14 also exert a blower effect,so that the accelerated individual fibers 5 together with the aircurrent are transported via the air channel 7 .Iadd.through thedischarge opening 8 and discharged into the groove 21 from a sideopposite the frontal wall 24 .Iaddend.against the frontal wall 24 andinto the annular groove 21 of the hollow body member 9. The fiber-aircurrent flows with a velocity which completely or approximatelycorresponds to the peripheral speed of the annular groove 21 against theaforesaid annular groove 21 of the hollow body member 9. By way ofexample, with a circumference of this annular groove 21 of 30centimeters and a speed of rotation of the hollow body member 9 of30,000 r.p.m. the peripheral speed of the annular groove 21 and the flowvelocity of the fiber-air current amounts to 9,000 meters per minute.Due to the centrifugal action the fibers glide in the annular groove 21.Iadd.and .Iaddend.are deposited fiber for fiber .[.between the needles22.]. until the desired yarn thickness is achieved. The air currentcleaned or freed of fibers is deflected in the axial direction of thehollow body member 9 and flows into the surroundings through the opening25 and the air ducts or channels 23, or into a non-illustrated suctionconduit. In addition to the air current which guides the fibers in thehollow body member 9, air is also sucked through the hollow shaft 17. Ifa joining yarn is held in front of the opening of the hollow shaft 17then such is seized by the secondary air stream and sucked into thehollow body member 9. There it is immediately placed into rotation bythe air current so that the forward end of such joining yarn is throwninto the annular groove 21 where it is twisted onto the there collectedfibers by virtue of the rotation of the hollow body member 9. In sodoing, the guide disk or plate 26 prevents that the joining yarn issucked into the opening 25.

If the joining yarn is now placed between the rollers 27a of thedelivery device 27 then this yarn pulls the collected fibers over thebacks of the forwardly inclined needles 20 disposed in the annulargroove 21, spins these fibers, and continuously removes such as a yarn28. The yarn 28 is withdrawn without interruption from the hollow bodymember 9 over the deflecting roller 29 by means of the rollers 27a ofthe delivery device 27 and then delivered to a non-illustrated windingmechanism.

In so doing, the needles fulfill the function of limiting the extent oftwist .[.of the yarn at the beginning of the yarn,.]. .Iadd.propagationfrom the yarn just formed, .Iaddend.in other words, prevent the fibers 5collected and lying in the annular groove 21 from being twisted .Iadd.in.Iaddend.by the yarn .Iadd.too early.Iaddend.. Formation of curls uponthe individual fibers contacting the spun or completed yarn is preventedin that the individual fibers themselves move with approximately thesame speed as the .[.beginning.]. .Iadd.forming point .Iaddend. of theyarn in the annular groove 21. Thus, there is no differential.Iadd.circumferential .Iaddend.speed between the delivered fibers andthe .Iadd.radial portion of the .Iaddend.withdrawn yarn, so that theindividual fibers .Iadd.while still air borne .Iaddend.cannot be.[.grasped.]. .Iadd.hit .Iaddend.by the yarn .[.in the air.]..Iadd.grasped .Iaddend.and .[.curl.]. .Iadd.curled .Iaddend.about suchyarn. Due to the acceleration of the fiber-air current the yarn tensionis considerably reduced since there no longer appears air resistance inthe direction of rotation of the hollow body member 9.

In FIG. 3 there is depicted a variant embodiment of .Iadd.the.Iaddend.inventive spinning device. In this case, the feed porcupineroller 2' and the separation roller 39 correspond in function andphysical structure to the corresponding rollers 2 and 3 of FIGS. 1 and2. However, in this case the acceleration roller is dispensed with byvirtue of an appropriate construction of the air channel 31. The housing30 is also correspondingly constructed. Whereas the air channel 7 ofFIG. 1 extends linearly from the acceleration roller 6 to the hollowbody member 9, in this embodiment the air channel 31 is of ring-shapedor annular construction possessing a cross-section which narrows in thedirection of the hollow body member. As a result, the fiber-air currentguided from the separation roller 39 to the hollow body member is placedinto rotation and simultaneously accelerated. It will be appreciatedthat the hollow body member is not visible in FIG. 3, since it iscovered by the guide core 32, yet it will be appreciated that mountingof this hollow body member corresponds to the embodiment of FIG. 2.Moreover, the direction of rotation of such hollow body member isopposite the direction of rotation of the separation roller 39,indicated by the arrow G.

In FIG. 4 there is depicted the physical construction of an air channel31, which in this embodiment does not guide the fiber-air current, as inthe case of FIGS. 1 and 2 into an annular groove 34 of a hollow bodymember 35 by means of .[.a limited opening, such as.]. opening 8 of FIG.1, rather in this case guides such fiber-air current through an annularor ring-shaped gap 33.

Additionally, in this embodiment the air is not .Iadd.only.Iaddend.conveyed by .[.blower means simultaneously revolving with.].the hollow body member, .[.rather.]. .Iadd.but also .Iaddend.by means ofa separate suction device or blower, schematically indicated at 50, towhich a plurality of spinning devices can be connected. The suction studor nipple 36 leads to this blower 50. The movement of the air isrepresented by the arrow H. Due to this suction a vacuum appears in thesealed hollow compartment 37, into which vacuum the air current cleanedor freed of fibers is .[.sucked.]. .Iadd.removed .Iaddend.through theopenings .Iadd.or air ducts .Iaddend.38 provided at the hollow bodymember 35. .Iadd.The openings or air ducts 38 communicate with theinside of the hollow body member 35 at a location in the frontal wall 42of the body member 35 which is radially spaced from the groove 34 toremove the air freed of fibers. .Iaddend.The remaining function is thesame as already described in connection with FIGS. 1 and 2.

It will be appreciated that the fiber-air current leads from theseparation roller 39 into the air channel 31. At this location it isplaced into rotation by virtue of the spiral-shaped configuration ofsuch air channel 31 and at the same time is accelerated, due to thenarrowing of the cross-section of the aforesaid air channel, to a speedwhich completely or approximately corresponds to the peripheral speed ofthe annular groove 34 of the hollow body member 35. The fiber-aircurrent is guided via the annular gap 33 which is open all around intothe annular groove 34 of the hollow body member 35. Here the fibers areseparated in the described manner from the fiber-air current, depositthemselves in the .[.needle field 40.]. .Iadd.groove .Iaddend.and arespun into a yarn 41. The air current freed of fibers is .[.sucked.]..Iadd.removed .Iaddend.through the openings 38 into the hollowcompartment 37 and conducted via the suction nipple 36 to the blower 50.

While there are shown and described present preferred embodiments of theinvention, it is to be distinctly understood that the invention is notlimited thereto but may be otherwise variously embodied and practicedwithin the scope of the following claims.

What is claimed is:
 1. A process for spinning staple fibers comprisingthe steps of:a. continuously delivering a sliver to a separation roller,b. separating individual fibers from said sliver in said separationroller, c. accelerating the individual fibers by means of an air currentsurrounding these individual fibers approximately to the peripheralvelocity of the inner wall of a .Iadd.quickly rotating .Iaddend.hollowbody member prior to delivery of said individual fibers to said hollowbody member, d. then delivering said individual fibers approximatelytangentially to the inner wall of .[.a.]. .Iadd.the .Iaddend.quicklyrotating hollow body member and forming thereat a fiber ring, e. andaxially withdrawing a yarn out of said fiber ring. .[.2. Apparatus forspinning staple fibers comprising a separation roller incorporatingmeans for separating individual fibers from a sliver, a rotatable hollowbody member for receiving the separated individual fibers, means foraccelerating the individual fibers by means of their surrounding airprior to delivery to said rotatable hollow body member, and at least onerotatable acceleration roller for contributing to the acceleration ofthe individual fibers and surrounding air disposed between saidseparation roller and said hollow body member..]. .[.3. Apparatus forspinning staple fibers as defined in claim 2, wherein said accelerationroller is provided with needles..]. .[.4. Apparatus for spinning staplefibers as defined in claim 3, wherein said acceleration roller isprovided with radial air passage means through which the air isconducted..]. .[.5. Apparatus for spinning staple fibers as defined inclaim 2, further including an air channel disposed between saidacceleration roller and said hollow body member, said air channelpossessing a cross-section which narrows from said acceleration rollerin the direction of said hollow body member.]. .[.6. Apparatus forspinning staple fibers comprising a separation roller incorporatingmeans for separating individual fibers from a sliver, a rotatable hollowbody member for receiving the separated individual fibers, means foraccelerating the individual fibers by means of their surrounding airprior to delivery to said rotatable hollow body member, and an airchannel for contributing to the acceleration of the individual fibersand surrounding air extending between said separation roller and saidhollow body member, said air channel possessing a cross-section whichnarrows from said separation roller in the direction of said hollow bodymember..]. .Iadd.
 7. Apparatus for spinning staple fibers comprising aseparation roller incorporating means for separating individual fibersfrom a sliver, a rotatable hollow body member for receiving theseparated individual fibers, a substantially V-shaped annular groove insaid hollow member for collecting the individual fibers, one wall ofsaid groove extending as a frontal wall inwardly towards the axis ofrotation of the hollow body member, means for accelerating theindividual fibers by means of their surrounding air prior to delivery tosaid rotatable hollow body member and at least one rotatableacceleration roller for contributing to the acceleration of theindividual fibers and surrounding air disposed between said separationroller and said hollow body member, and a stationary air channel forfeeding fibers to said hollow body member disposed between saidacceleration roller and said hollow body member and having a dischargeopening arranged for discharging the fibers into the groove from a sideopposite said inwardly extending frontal wall. .Iaddend..Iadd. 8.Apparatus for spinning staple fibers as defined in claim 7, wherein saidacceleration roller is provided with needles. .Iaddend..Iadd. 9.Apparatus for spinning staple fibers as defined in claim 8, wherein saidacceleration roller is provided with radial air passage means throughwhich the air is conducted. .Iaddend..Iadd.
 10. Apparatus for spinningstaple fibers as defined in claim 7, said air channel possessing across-section which narrows from said acceleration roller in thedirection of said hollow body member. .Iaddend. .Iadd.
 11. An apparatusfor spinning staple fibers including a separation roller incorporatingmeans for combing out individual fibers from a sliver, a rotatablehollow body member for receiving the separated individual fibers, asubstantially V-shaped annular groove in said hollow member forcollecting the individual fibers, one wall of said groove extending as afrontal wall inwardly towards the axis of rotation of the hollow bodymember, and means for accelerating the individual fibers by means oftheir surrounding air prior to the delivery to said rotatable bodymember, and a stationary air channel for contributing to theacceleration of the individual fibers and the surrounding air extendingbetween the separation roller and said hollow body member and having adischarge opening arranged for discharging the fibers into the groovefrom a side opposite said inwardly extending frontal wall insubstantially tangential direction with respect to the groove andpossessing a cross section which narrows from the separation roller inthe direction of said hollow body member. .Iaddend. .Iadd.
 12. Apparatusfor spinning staple fibers including a separation roller incorporatingmeans for combing out individual fibers from a sliver, a rotatablehollow body member for receiving the separated individual fibers, asubstantially V-shaped annular groove in said hollow member forcollecting the individual fibers, one wall of said groove extending as afrontal wall inwardly towards the axis of rotation of the hollow bodymember, means for accelerating the individual fibers by means of theirsurrounding air prior to the delivery to said rotatable hollow bodymember, said accelerating means comprising outwardly extending air ductscommunicating with the inside of the hollow body member at a location inthe frontal wall radially spaced from the groove to remove the air freedof fibers, and a stationary air channel for feeding fibers to saidhollow body member and for contributing to the acceleration of theindividual fibers and the surrounding air extending between theseparation roller and said hollow body member, said air channel having adischarge opening being arranged for discharging the fibers into thegroove from a side opposite said inwardly extending frontal wall intangential direction with respect to the groove and possessing a crosssection which narrows from the separation roller in the direction ofsaid hollow body member. .Iaddend. .Iadd.
 13. Apparatus for spinningstaple fibers comprising a separation roller incorporating means forseparating individual fibers from a sliver; a rotatable hollow bodymember for receiving the separated individual fibers, said member havingan annular groove and a frontal wall extending inwardly towards the axisof rotation of said hollow body member; and means for accelerating theindividual fibers by means of their surrounding air prior to delivery tosaid rotatable hollow body member, said means including a stationary airchannel for contributing to the acceleration of the individual fibersand surrounding air extending between said separation roller and saidhollow body member, said air channel possessing a cross section whichnarrows from said separation roller in the direction of said hollow bodymember to deliver the individual fibers and surrounding air against saidfrontal wall whereby the fibers move into said groove and the fiberfreed air is deflected radially inwardly along said frontal wall forremoval therethrough. .Iaddend..Iadd.
 14. Apparatus as set forth inclaim 13 wherein said hollow body member further has air ducts on a sideof said frontal wall opposite said annular groove for exhausting of thefiber freed air. .Iaddend..Iadd.
 15. Apparatus as set forth in claim 13wherein said hollow body member further includes openings in saidfrontal wall radially inwardly of said groove and which furthercomprises a suction device for exhausting of the fiber freed air throughsaid openings. .Iaddend. .Iadd.
 16. Apparatus as set forth in claim 13further comprising a housing having said separation roller and saidstationary air channel mounted therein. .Iaddend..Iadd.
 17. Apparatus asset forth in claim 16 wherein said means including said stationary airchannel is a guide member removably mounted in said housing..Iaddend..Iadd.
 18. Apparatus as set forth in claim 16 which furthercomprises an acceleration roller mounted in said housing between saidseparation roller and said hollow body member. .Iaddend..Iadd. 19.Apparatus as set forth in claim 13 wherein said air channel is ofannular construction. .Iaddend..Iadd.
 20. Apparatus as set forth inclaim 13 further comprising a centrally located opening in said frontalwall of said hollow body member and a hollow shaft extending throughsaid opening for the removal of twisted fibers from said groove as ayarn. .Iaddend..Iadd.
 21. Apparatus as set forth in claim 20 whereinsaid hollow shaft has a guide disk at one end for preventing the yarnfrom being sucked into said opening in said frontal wall. .Iaddend..Iadd.
 22. Apparatus for spinning staple fibers including a separationroller incorporating means for combing out individual fibers from asliver, a rotatable hollow body member for receiving the separatedindividual fibers, a substantially V-shaped annular groove in saidhollow member for collecting the individual fibers, one wall of saidgroove extending as a frontal wall inwardly towards the axis of rotationof the hollow body member, and means for accelerating the individualfibers by means of their surrounding air prior to delivery to saidrotatable body member, said means for accelerating the surrounding aircomprising suction creating means for subjecting the hollow body memberto sub-atmospheric pressure and a stationary air channel forcontributing to the acceleration of the individual fibers and thesurrounding air stream extending between the separation roller and saidhollow body member and having a discharge opening arranged opposite saidfrontal wall for discharging the fibers into the groove in substantiallytangential direction with respect to the groove and possessing across-section which narrows from said separation roller in the directionof said hollow body member, said suction creating means being inunrestricted direct communication with the interior of the hollow bodymember. .Iaddend..Iadd.
 23. Apparatus for spinning staple fibersincluding a separation roller incorporating means for combing outindividual fibers from a sliver, a rotatable hollow body member forreceiving the separated individual fibers, a substantially V-shapedannular groove in said hollow member for collecting the individualfibers, one wall of said groove extending as a frontal wall inwardlytowards the axis of rotation of the hollow body member, and means foraccelerating the individual fibers by means of their surrounding airprior to delivery to said rotatable body member, said means foraccelerating the surrounding air comprising suction creating means forsubjecting the interior of the hollow body member to sub-atmosphericpressure and a stationary air channel for contributing to theacceleration of the individual fibers and the surrounding air streamextending between the separation roller and said hollow body member andhaving a discharge opening arranged opposite said frontal wall fordischarging the fibers into the groove in substantially tangentialdirection with respect to the groove and possessing a cross-sectionwhich narrows from said separation roller in the direction of saidhollow body member, said suction creating means being in directcommunication with the interior of the hollow body member. .Iaddend..Iadd.
 24. Apparatus as set forth in claim 11, said means foraccelerating the fibers further comprising a suction device forexhausting air from said rotatable body member. .Iaddend.